Hi @Doc Godfrey, welcome to BP.Your Cash on Cash sounds high to me.I get total expenses in excess of $1400/month (numbers below) and then cash flow of about $165/month.I'm not 100% sure how you are financing this, so I can't give you an accurate CoC ROI.  

I'm interested in using some portion of that to house hack once I know what city my first full time job will be in.My first concern is, I often see it recommended that people should use a low down payment loan, such as an FHA loan, to purchase a small multifamily property to house hack, but this seems like an excessive amount of leverage to me.  

When the transaction closes the lender will payoff your balance on the HML and any excess proceeds, i.e. the $14K in my example above, are generally wired into your bank account as part of the closing process.If you ever want to model out specific or hypothetical scenarios to dive into this further, feel free to PM me and we'll set some time to talk.

Those large issues being the following:The basement that is mostly underground is unfinished and the house sits on the side of a hill, so when it rains, the water builds up around a few areas and eventually over time will penetrate the concrete blocks in the basement causing mold to grow on the wall and make the Drylok start to peel in the areas that have the moisture issue.

It will also protect anything under the concrete from being damaged by moisture wicking thru the tile and concrete.I don't know what kind of tile you have, but if it is glazed you will not be able to color it. 

I know this is based on the goals I have for my self but a general rule of thumb, after deducting expenses from my cash flow, should I 
A) Use the extra $ and put it in the mortgage 
B) Save, save, save to buy anoth...

But I am planning on linking the fans to a moisture sensor instead of the light in the future, because one of the mirrors has moisture damage since the fan goes out the moment the light does (and so to many other mirrors in the complex), and the fan is also continuously running at other times when it doesn't need to be.  

@Josh Gibson$50 a month is pretty cheap.Keep it up, but perhaps add in that it must be cut at least twice a month, and the yard cleaned of trash or normal sticks and excessive leaves.

As a result, home prices began to climb quickly with an excess of buyers competing for fewer available homes.

I HIGHLY recommend one with a thermal imaging scan to detect moisture collection behind walls and roofs.